Here’s the second trailer to The Dark Knight, as it’s been shown at the beginning of Iron Man.

Here’s MTV’s scene by scene analysis. Note at 1:54 – 1:55 and 2:03 brief glimpses of Harvey Dent (Aaron Eckhart) as Two-Face (First, Dent screaming with his face lying in gasoline – or perhaps some sort of acid or solvent – and then, Dent riding in a car where the scabs on the left side of his face are barely visible and you can just make out the multi-colored left side of his suit.)